I'm looking to fit original satnav, I currently have a Pioneer satnav head unit. I've been looking for either CD70, DVD90 or DVD100. CD70 is almost ruled out because of the capacity of maps on the discs. Then looking for a DVD90 on ebay, I asked a couple of questions and it turns out the seller also has a DVD100 for sale. Except for the 6 disc changer in the DVD100, are there any differences?